Struct StatsExtras 

pub struct StatsExtras {
    pub max_local_deletion_time: i64,
    pub tombstone_drop_times: Vec<(i64, u64)>,
    pub max_timestamp: Option<i64>,
    pub max_ttl: Option<i64>,
}

Additional STATS-component facts decoded by parse_stats_extras that are not part of the repair-coordination metadata: the SSTable’s maximum local deletion time and the estimated tombstone-drop-times histogram.

Decoded best-effort: a Statistics.db that parses today must keep parsing, so callers treat an Err from parse_stats_extras as “leave the existing placeholders” rather than propagating it.

Fields

max_local_deletion_time: i64

SSTable maxLocalDeletionTime, normalized so that the version-specific “no tombstones” sentinel (i32::MAX for nb, 0xFFFF_FFFF for oa/da) maps to [NO_DELETION_TIME] (i64::MAX); any real deletion time is the seconds-since-epoch value as i64.

tombstone_drop_times: Vec<(i64, u64)>

estimatedTombstoneDropTime histogram as (point, count) pairs. Empty when the histogram carries no bins (the common case for SSTables with no tombstones).

max_timestamp: Option<i64>

Authoritative SSTable maxTimestamp (write timestamp, microseconds) decoded from STATS field 4 (issue #1729). None when the SSTable carries no live timestamp — Cassandra’s MetadataCollector seeds the tracker with Long.MIN_VALUE, so an on-disk value of i64::MIN is the “no timestamps recorded” sentinel and is surfaced fail-closed as None (consumers that require a real max — e.g. the #1388 drop gate — must NOT proceed as if a max were known). Any other value is the true maximum.

This intentionally replaces the historical max_timestamp = min_timestamp placeholder in crate::parser::enhanced_statistics_parser, which silently reported the MIN write timestamp as the max.

max_ttl: Option<i64>

Authoritative SSTable maxTTL (seconds) decoded from STATS field 9 (issue #1537). Cassandra’s MetadataCollector seeds the TTL tracker with Cell.NO_TTL (0) and updates it only from EXPIRING cells, so a maxTTL of 0 means “no expiring cells” and is surfaced fail-closed as None. Any positive value is the true maximum TTL across the SSTable’s expiring cells. The compaction TTL-expiry LDT floor (issue #1537, [crate::storage::write_engine::merge::compute_expiry_ttl_ldt_floor]) needs this authoritative maximum: the enhanced (nb) parser only decodes the EncodingStats minTTL baseline and honestly leaves max_ttl = None, so this best-effort STATS-extras walk is the only source of the true maximum.

Trait Implementations

impl Clone for StatsExtras

fn clone(&self) -> StatsExtras

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for StatsExtras

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for StatsExtras

fn default() -> Self

The default reported when no STATS component is locatable: “no tombstones” max-LDT ([NO_DELETION_TIME]), an empty histogram, and no authoritative maxTimestamp (fail-closed None).